Starting with thermostat replacement,can't see a way to remove thermostat housing w/out removing efi housing or whatever the %$!&@ that is blocking access to the housing at the end of top radiator hose!!! Any easier way to replace such a simple part?
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the thermostat housing is at the lower radiato hose that clamps onto the thermostat housing. With engine cool, drain fluid from radiator. The lower house is held on with a clamp. Un tighten hose clamp and remove hose.Unbolt thermostat housing and remove. Remove thermostat Clean housing and thermostat seat. Insatll new thermostat and gasket, with gasket sealer, and tighten thermostat housing.Reinstall hose and tighten clamp. Refill radiator with anti freez coolant.Start engine and let warm up to normal Check the heater temp. If heat is good, shut off engine and let cool down. Re check coolant level and fill if needed.Also when running, check for any leaks at hose and thermostat housing. If all checks good, YOUR DONE.
follow upper radiator hose to aluminum housing this is where the thermostat is. be sure engine is cool remove radiator cap or reservoir cap if no cap on radiator disconnect upper hose from thermostat housing. remove two bolts in housing and remove housing. replace thermostat and reassemble. when finished refill anti- freeze leave cap off and start vehicle with heat on high. run the vehicle like this until air stops bubbling out of coolant and heat is hot steadily. continue topping off coolant during this process and be sure cooling fans engage before completion. then youre all done
You will need to remove your air cleaner and duct assembly. You will then see the thermostat housing sandwiched between the back of the intake manifold and the exhaust crossover pipe. The service manual says to remove the exhaust crossover pipe, but trust me, you do not want to attempt this unless you have access to a torch to heat the nuts that hold the thing to the exhaust manifolds. If you break a stud, then you are going to be removing an exhaust manifold for broken stud removal. If you take the 8mm screws out of the heat shield on the exhaust crossover pipe, you can wiggle the heat shield out. This will provide enough room to get the lower thermostat housing bolt out. It is a pain to do it this way, but it works and will prevent broken exhaust pipe studs. Sometimes the little 8mm bolts will also break, but since they only hold the heat shield, it is of no great consequence.
Then all you have to do is remove the two bolts that hold the thermostat housing to the manifold. The thermostat is directly under it. Then the only other real "trick" is getting the thermostat and O-ring to stay in the correct position while you put the thermostat bolts back in. A trick that I use is a small wooden wedge. I put the thermostat housing into place over the thermostat and O-ring, then place mt wedge between the thermostat housing and the crossover pipe to hold the thermostat housing in place while I start the bolts. Otherwise, the thermostat tends to slide out the bottom while you are trying to get the bolts started.
More often than not the problem is a thermostat that is stuck open, causing heater output to take a very long time to heat up. Replacing the thermostat is as follows:
Disconnect the negative battery cable (if you have an anti-theft radio, make sure you have the code). Drain the cooling system (petcock bottom of radiator) Follow the top radiator hose back to where it connects to the engine. The part with the two bolts in it that the hose connects to is the thermostat housing. You may have to remove the hose in order to remove the housing. When you have removed the housing, note the position of the thermostat before you remove it. When installing, use new gasket, etc. (you might be able to get away with not removing the radiator hose, but it is recommended) Be prepared for a bit of spillage when you remove the housing.
Hope this helps you.
Thermostat replacement on 3.4 liter, Not the thermostat housing is between the Throttle body and exhaust crossover. If you have small haves and the right tools you can remove the two botls without removing the crossover and throttle body. The bottom bolt to the thermostat does not have to come all the way out, there is a cut out on the housing so you can slid it out. Good luck and take your time.
Remove the air cleaner and duct assembly.
Drain the coolant until the coolant level is below the thermostat.
Remove the crossover exhaust pipe.
Remove the radiator hose from the thermostat housing.
Remove the thermostat housing bolts and clean any sealer from the bolt threads.
Remove the thermostat housing and gasket.
Remove the thermostat.
Install the thermostat.
Install the thermostat housing bolts and tighten them to 18 ft. lbs. (25 Nm).
Install the radiator hose to the thermostat housing.
Most thermostats are located in the upper radiator hose housing mounted to engine block. Make sure engine is cold put a catch pan under your car to catch any antifreeze that comes out. Remove the two bolts holding the housing on the engine and remove thermostat and gasket. Clean engine block where gasket goes very good and also the housing, have to remove all gasket material so when installing new one it will seal and wont cause a leak. Make sure when you put the thermostat back in it goes in spring side down towards engine. Replace housing and bolts. replace lost coolant with a 50/50 mixture in your recovery tank. Start engine let heat to temp and check for leaks.